Valve grinder



L'BLINKILDE.

VALVE GRLNDER.

PPLlCATION FILED MAR. 1.5. 1-920.

Patented hln..

Feb. 28, 1922.

UNITED Y STATES PATENT OFFICE..

vnnvn ennvnnn.

Lil-203354.

Application filed March 15, i920.

To all whom it may concern:

Be it known that l, JnNs BLiNnijLnn, a citizen of the United States of America, re` siding` at Detroit, in the county of layne and State of Michigan, have invented certain new and useful mprovements in Valve Grinders, of which the following is a speci ication, reference being had therein to the accompanying drawings. Y

This invention relates to devicesrv for use in -grinding valves of internal combustion engines to their seats and its object is to facilitate the operation and increase the accuracy of the work, and, further, to 'provide a machine for the purpose which is cheap to manufacture and may be quickly and easily applied to the work and operated by an unskilled person. It. is also an object, to provide a machine which may be readily adjusted for operation upon various makes of engines and which will afford a. yielding pressure uponthe valve operated upon to hold thek same to its seat and is arranged to provide for variations in valve and seat and exert an even pressure thereon, A further. object is to provide the machine with simple and eflicient means for rotating the valve and to also provide certain other new and useful features in the construction, arrange ment and'combination of parts, all as hereinafter more fully described. p

With the above and other ends in view, the invention consists in the matters hereinafter set forth and more particularly set forth in the appended claims reference be-y ing had to the accompanying drawing, in which-- Figure l is a side elevationof a machine illustrative of thel invention; y

Fig. 2 aperspective view of the same, illustrating the applicationof the same in use; and

Fig. Sis a detail of a frame joint.

In the operation of` internal combustion engines, it is found thatafter period of service it becomes necessary to grind these valves to their seats to prevent leakage due to wear and fitting of the contact surfaces, and this grinding is accomplished by placing asmall amount of grinding material upon the valve seat and then turning the valve in contacty with its seatA under pressure. In order to make a perfect seat in such operation, it is necessary that the valve be firmly and evenly held with an even pressure toward its seat and turned while so held. It

Specification of Letters Patent.

Patented Feb. 2K8, 1922.

serial No. 365,817.

is diflicult operation, requiring Skill to so hold and turn the valve that a good seat will be formed and the operation is slow.

lith the use of the machine embodying the present invention, the valve is securely held and pressed upon its seat with a constant even pressure which is not modified by the turning operation and the valve is always free to tilt slightly and conform to its seat, thus making a perfect grinding operation without great attention or skill on the part of the operator.

As illustrated in the drawing, the machine comprises a base l which is formed with a. longitudinal slot 2 to receive a bolt or bolts 3 by means of which the base is securelyhel d down upon the flat upper surface Il: of a. cylinder block 5, in. which upper surface, the seats for the valves 6 are formed, said bolts 3 being engaged with any of the usual openings inthe face of the cylinder block. From therear end portion of the-base l rises a post Y preferably formed integral with the base, and attached tothe upper end of the post is a yoke arm S carrying an adjustable bracket 9 at its free end, which bracket is provided with alined bearings l0 for a vertical shaft l1 which is free to turn therein. On this shaft below the bracket, is secured. a pulley l2 and between said pulls),7 and the lower of the bearings l() is sleeved upon the shaft, a coiled spring 13 which normally exerts a force tending to hold the shaft removedV endwise in its bearings with a head le on the upper end of the shaft in contact withthe upper of said bearings. To' the lower end of the shaft is attached a block r1C by means of atransverse pivot pin 16 and the lower end of this block has a transverse slot to receive a pair of fingers 17 which are pivot-ally attached to the block and pivotally connected by means of aipivot pin 1S extending transversely of the block in a direction at right angles to the pivot lGrand through openings in the overlapped ends of the iinger 17. At their free ends, these lingers are formed to engage openings inthe valves 6 usually provided for the engage` ment of a tool by means of which 'they may be turned while seated in their seats for the purpose of grinding the valves to their n different makes of motors, and by reason of By grasping the free end of the cord 2G the double pivotal connection of these fingers to the shaft by the pivots 16 and' 1 extending transversely of the shaft and block at right angles to each other umvcrsal connection of the lingers to the shaft is afforded so that when the Jfingers are engaged with a valve, the valve and shaft will be free to tilt or move relatively in a lateral direction, thus providing for slight inaccuracies in the valve and seat and in the alinement of the shaft with the valve axis. Further, by Jthe pivotal attachment of the lingers to the block, said lingers may be detached and a turning tool of another form substituted therefor, as when the valves are provided with a slot or other means instead of holes.

The spring 13 exerts a constant force to hold the lingers engaged with the holes in the valve and to put a pressure upon the valve to hold it into its seat, and to vary the tension of the spring, the bracket 9 is adi justably attached to the arm 8 by means of bolts 19 passing through a vertical slot 20 in the bracket and engaging openings in the arm, said slot extending parallel to the longitudinal axis of the shaft 11, and in order that the fingers 17 may be readily engaged with or disengaged from the valve, the arm 8 is pivotally attached to the upper end of the post 7 by means of a transverse pivot bolt 21, thus permitting said arm to be swung upwardly to lift the fingers out of engagement with the work and so that the valve may be readily lifted from its seat from time to time durinof the grinding operation for the purpose o examination of the valve and its seat. To hold the arm 8 in its flO lowered or operative position with the shaft 11 in perfect vertical relation to the base 1, and consequently in proper relation to the valve to be ground, the pivoted end of said arm is forked to embrace the upper end of theV post, the pivot bolt 21 passingthrough openings in the arms 22 of thisforked end and through an opening in the interposed end of the post, and adjacent the lower ends of lthese arms'22, they are each formed with a slot 23 extending inward from one edge of the arm to receive a screw bolt 24C ex'- tending through the slots and an opening in the post Aand provided with a thumb nut 25, said slots being curved concentrically with the axis of the pivotal attachment of the arm to the post. These slots are also of such a length as to limit the downward turning movement of the arm. Y

To rotate the shaft 11 and thus turn the valve with which the ngers 17 are engaged, a flexible belt, cord or cable 26 is given a single wrap or turn around the pulley 12 and one end thereof made fast to a coiled spring 27, the opposite end of which is attached in any suitable manner to the post 7.

as illustrated in Fig. 2, and pulling thereon, the operator causes a rotation of the pulley and shaft in one direction, and by letting up on the cord, the spring having been put under tension, will exert a force to rotate the shaftin a reverse direction. Very simple and efiicient means are thus provided for rotating the shaft to turn the valve back and forth on its seat, and the operation of this turning means will have no tendency to tilt the valve on its seat and will not interfere with the steady constant pressure exerted by the spring 13 upon the valve to hold it .against its seat, evenly during its rotation.

By employing a suitable holding frame which is illustrated as comprising the basel, post 7 and arm 8, the means carried thereby for engaglng and turning the engine valve is rigidly held in proper verticalrelation to the valve and its seat, as the base of the frame is arranged to be secured upon the upper iiatsurface of the engine block 5 and in all engines having la removable head, this surface forms a perfectseat for the frame. When the machine is used upon other types of engine, the frame may bereadily `bolted upon any convenient flat surface or surfaces which are parallel with the plane of the valve seat and the tool or lingers 17 brou ht into engagement with the valve, the mova le bracket 9 providing'for an adjustment of the shaft vertically. Obviously, changes may be made within the scope of the appended claims without departing from the spirit of the invention, and I do not, therefore, limit myself ,to the construction or arrangement of parts shown.

1. In a device of the character described, the combination of asupporting frame comprising a base, a post andan armpivotally attached to the post, .a vertical shaft mount ed in bearings on the free end of the arm, means for turning the shaft, a tool for en-V gagingand turning a valve, and a member connecting said tool and lower end of said shaft, said member being connected to said shaft by a transverse pivot and to said tool by a4 transverse pivot extending at right angles to the other pivot.

2. In a device of the character described, the combination of a supporting frame having .a laterally extending arm, a bracket adjustably attached to said arm and provided with bearings, a shaft in said bearings free to rotate and move longitudinally therein, a pulley secured on the shaft, a tool pivotally attached to the lower end of the shaft by transverse pivots extending at right angles to each other, a spring sleeved on the shaft between the bracket and pulley, a cord wrapped about the pulley, and a spring attached to one end of the cord at yone end and at its opposite end to the frame.

3. In a device of the character described, the combination of a supporting frame comprising L longitudinally slotted base, a vertical post at one end of the base and a laterally extending arm pivotally attached to the upper end of the post, said pivotal connection of said arm to said post being formed to limit the turning movement of seid arm, a bracket adjustably secured to the free end of the arm and provided with bearings, a shaftv in said bearings free to turn and to move longitudinally therein, L tool on the lower end of the shaft to engage a valve and comprising a pair of pivoted fingers, :i coiled spring sleeved on the shaft to move the same l5 longitudinally toward the valve, a pulley secured in the shaft, a cord wrapped about the pulley, and a spring connecting one end of the cord to the frame.

In testimony whereof I affix my signature 20 in the presence of two witnesses.

J ENS BLINKILDE.

Witnesses ANNA M. Donk, CHAs. W. STAUTFIGER. 

